QT中异形窗口的绘制（winEvent处理WM_NCHITTEST消息）

// include <windows.h>

bool MyDialog::winEvent(MSG* msg, long* result)
{
    const int captionHeight = 25;
    const int frameWidth = 6;
    
    if (msg->message != WM_NCHITTEST) return false;

    QPoint pos = mapFromGlobal(QCursor::pos());
    int w = width();
    int h = height();

    if (QRect(frameWidth, captionHeight, w-frameWidth-frameWidth, h-captionHeight-frameWidth).contains(pos))
    {
        *result = HTCLIENT;
    }
    else if (QRect(0, 0, w, captionHeight).contains(pos))
    {
        *result = HTCAPTION;
    }
    else if (QRect(0, captionHeight, frameWidth, h-captionHeight-frameWidth).contains(pos))
    {
        *result = HTLEFT;
    }
    else if (QRect(w-frameWidth, captionHeight, frameWidth, h-captionHeight-frameWidth).contains(pos))
    {
        *result = HTRIGHT;
    } 
    else if  (QRect(frameWidth, h-frameWidth, w-frameWidth-frameWidth, frameWidth).contains(pos))
    {
        *result = HTBOTTOM;
    } 
    else if (QRect(0, h-frameWidth, frameWidth, frameWidth).contains(pos))
    {
        *result = HTBOTTOMLEFT;
    }
    else if (QRect(w-frameWidth, h-frameWidth, frameWidth, frameWidth).contains(pos))
    {
        *result = HTBOTTOMRIGHT;
    }    
    return true;
}